
Dorothy Counts, one of the first black students to enter the newly desegregated Harry Harding High School is mocked by whites on her first day of school, photo by Douglas Martin
(source)

(source)
At 15 years of age, on September 1957, Dorothy Counts
was one of the first black students admitted to the Harry Harding High School, in Charlotte, North Carolina. After four days of harassment that threatened her safety, her parents forced her to withdraw from the school. …
The harassment started when the wife of John Z. Warlick, the leader of the White Citizens Council, urged the boys to “keep her out” and at the same time, implored the girls to spit on her, saying, “spit on her, girls, spit on her.” Dorothy walked by without reacting, but told the press that many people threw rocks at her—most of which landed in front of her feet—and that many spat on her back. More abuse followed that day. She had trash thrown at her while eating her dinner and the teachers ignored her. The following day, she befriended two white girls, but they soon drew back because of harassment from other classmates. Her family received threatening phone calls. (source)
A similar case is this one. More on segregation here. More iconic images of human rights violations here.